<!DOCTYPE html>
<html>
<head>
    <title>Hello world!</title>
    <meta charset="utf-8"/>
</head>
<body>
<p>Hello world!</p>

<form action="/advanced-java/demo3" method="post">
    用户名：<input name="username" type="text"> <br>
    密码：<input name="password" type="password"> <br>
    <input type="submit" value="提交数据">
</form>

</body>
</html>
